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【多选题】
PCB 工程文件下可新建的文件类型包括( )。A.
Schematic
B.
PCB
C.
Schematic library
D.
PCB library
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反馈参考答案：
举一反三
【简答题】在反射光中观察某单色光所形成的牛顿环。其平凸玻璃与平板玻璃之间充满折射率为2.0的透明介质，且第2级亮环与第3级亮环间距为2mm，那么第10和20级亮环之间的距离为 mm。（保留两位小数）
【单选题】If you have a cold, you should _____________.
A.
use a handkerchief
B.
stay at home as you do not want to give your cold to other people
【单选题】If you have a cold, what symptoms may you get? ( )
A.
have a stuffy nose
B.
have a stomach
C.
have a toothache
D.
have a sprained ankle
【单选题】If you have a cold , who will you be treated by?
A.
Dr. Gupta
B.
Dr. Cho
C.
Dr. Lottner
D.
Dr. David
【单选题】If you have a cold, stay at home so that you won't spread it to _____.
A.
another
B.
the other
C.
others
D.
the others
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